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You searched for: creator:"J. GRAVES"
[texts]ANCIENT CORPORATION BY-LAWS (Volume 1) - J. GRAVES
"ANCIENT CORPORATION BY-LAWS" is an article from Transactions of the Kilkenny Archaeological Society, Volume 1. View more articles from Transactions of the Kilkenny Archaeological Society.View this article on JSTOR.View this article's JSTOR metadata.You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41576094
Downloads: 35
[texts]ANCIENT ENCAUSTIC FLOORING TILES (Volume 1) - J. GRAVES
"ANCIENT ENCAUSTIC FLOORING TILES" is an article from Transactions of the Kilkenny Archaeological Society, Volume 1. View more articles from Transactions of the Kilkenny Archaeological Society.View this article on JSTOR.View this article's JSTOR metadata.You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41576098
Downloads: 36
[texts]ANCIENT STREET ARCHITECTURE IN KILKENNY (Volume 1) - J. GRAVES
"ANCIENT STREET ARCHITECTURE IN KILKENNY" is an article from Transactions of the Kilkenny Archaeological Society, Volume 1. View more articles from Transactions of the Kilkenny Archaeological Society.View this article on JSTOR.View this article's JSTOR metadata.You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41576093
Downloads: 43
[texts]Clinical Lectures on the Practice Of Medicine - Robert J. Graves
Book digitized by Google from the library of Oxford University and uploaded to the Internet Archive by user tpb.
Downloads: 78
[texts]Woman in America: Being an Examination Into the Moral and Intellectual Condition of American ... - A. J. Graves
Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
Downloads: 86
[texts]A Correction to the Standard Galactic Reddening Map: Passive Galaxies as Standard Crayons - J. E. G. Peek
We present corrections to the Schlegel, Finkbeiner, Davis (SFD98) reddening maps over the Sloan Digital Sky Survey northern Galactic cap area. To find these corrections, we employ what we dub the "standard crayon" method, in which we use passively evolving galaxies as color standards by which to measure deviations from the reddening map. We select these passively evolving galaxies spectroscopically, using limits on the H alpha and O II equivalent widths to remove all star-forming galaxies from t...
Downloads: 2
[texts]Measuring Ages and Elemental Abundances from Unresolved Stellar Populations: Fe, Mg, C, N, and Ca - Genevieve J. Graves
We present a method for determining mean light-weighted ages and abundances of Fe, Mg, C, N, and Ca, from medium resolution spectroscopy of unresolved stellar populations. The method, pioneered by Schiavon (2007), is implemented in a publicly available code called EZ_Ages. The method and error estimation are described, and the results tested for accuracy and consistency, by application to integrated spectra of well-known Galactic globular and open clusters...
Downloads: 1
[texts]Magnificent Magnification: Exploiting the Other Half of the Lensing Signal - Eric M. Huff
We describe a new method for measuring galaxy magnification due to weak gravitational lensing. Our method makes use of a tight scaling relation between galaxy properties that are modified by gravitational lensing, such as apparent size, and other properties that are not, such as surface brightness. In particular, we use a version of the well-known fundamental plane relation for early type galaxies...
Downloads: 5
[texts]Dissecting the Red Sequence - III. Mass-to-Light Variations in 3D Fundamental Plane Space - Genevieve J. Graves
The Fundamental Plane has finite thickness and is tilted from the virial relation, indicating that dynamical mass-to-light ratios (Mdyn/L) vary among early type galaxies. We use a sample of 16,000 quiescent galaxies from the Sloan Digital Sky Survey to map out variations in Mdyn/L through the 3D Fundamental Plane space defined by velocity dispersion (sigma), effective radius (R_e), and effective surface brightness...
Downloads: 17
[texts]Dissecting the Red Sequence. IV. The Role of Truncation in the Two-Dimensional Family of Early-Type Galaxy Star Formation Histories - Genevieve J. Graves
In the three-dimensional parameter space defined by velocity dispersion, effective radius (R_e), and effective surface brightness (I_e), early-type galaxies are observed to populate a two-dimensional fundamental plane (FP) with finite thickness. In Paper III of this series, we showed that the thickness of the FP is predominantly due to variations in the stellar mass surface density (Sigma_*) inside the effective radius R_e...
Downloads: 14
[texts]Dissecting the Red Sequence--II. Star Formation Histories of Early-Type Galaxies Throughout the Fundamental Plane - Genevieve J. Graves
This analysis uses spectra of ~16,000 nearby SDSS quiescent galaxies to track variations in galaxy star formation histories along and perpendicular to the Fundamental Plane (FP). We sort galaxies by their FP properties (sigma, R_e, and I_e) and construct high S/N mean galaxy spectra that span the breadth and thickness of the FP. From these spectra, we determine mean luminosity-weighted ages, [Fe/H], [Mg/H], and [Mg/Fe] based on single stellar population models using the method described in Grave...
Downloads: 3
[texts]Dissecting the Red Sequence--I. Star Formation Histories of Quiescent Galaxies: The Color-Magnitude vs. the Color-Sigma Relation - Genevieve J. Graves
We use a sample of ~16,000 non-emission line galaxies from the SDSS to investigate the physical parameters underlying the well-known color-magnitude and color-sigma relations. Galaxies are sorted in terms of velocity dispersions (sigma), luminosity (L), and color, and their spectra are stacked to obtain very high S/N mean spectra for stellar population analysis. This allows us to map mean luminosity-weighted ages, [Fe/H], [Mg/H], and [Mg/Fe] in sigma-L-color space...
Downloads: 3
[texts]Strontium and Barium In Early-Type Galaxies - Charlie Conroy
The detailed abundance patterns of the stars within galaxies provide a unique window into the history of star formation (SF) at early times. Two widely used `chronometers' include the alpha and iron-peak elements, which are created on short and long timescales, respectively. These two clocks have been widely used to estimate SF timescales from moderate-resolution spectra of early-type galaxies. Elements formed via s-process neutron captures (e.g., Sr and Ba) comprise a third type of chronometer,...
Downloads: 3
[texts]Ages and Abundances of Red Sequence Galaxies as a Function of LINER Emission Line Strength - Genevieve J. Graves
Although the spectrum of a prototypical early-type galaxy is assumed to lack emission lines, a substantial fraction (likely as high as 30%) of nearby red sequence galaxy spectra contain emission lines with line ratios characteristic of low ionization nuclear emission-line regions (LINERs). We use spectra of ~6000 galaxies from the Sloan Digital Sky Survey (SDSS) in a narrow redshift slice (0.06 < z < 0.08) to compare the stellar populations of red sequence galaxies with and without LINER-like em...
Downloads: 2
[texts]From Galaxy Clusters to Ultra-Faint Dwarf Spheroidals: A Fundamental Curve Connecting Dispersion-supported Galaxies to Their Dark Matter Halos - Erik J. Tollerud
We examine scaling relations of dispersion-supported galaxies over more than eight orders of magnitude in luminosity by transforming standard fundamental plane parameters into a space of mass (M1/2), radius (r1/2), and luminosity (L1/2). We find that from ultra-faint dwarf spheroidals to giant cluster spheroids, dispersion-supported galaxies scatter about a one-dimensional "fundamental curve" through this MRL space...
Downloads: 8
[texts]The Slow Death (or Rebirth?) of Extended Star Formation in z~0.1 Green Valley Early-Type Galaxies - Jerome J. Fang
UV observations in the local universe have uncovered a population of early-type galaxies with UV flux consistent with low-level recent or ongoing star formation. We present resolved UV-optical photometry of a sample of 19 SDSS early-type galaxies at z~0.1 drawn from the sample originally selected by Salim & Rich (2010) to lie in the bluer part of the green valley in the UV-optical color-magnitude diagram as measured by GALEX...
Downloads: 3
[texts]Teaching Astronomy with an Inquiry Activity on Stellar Populations - Marc Rafelski
We describe a new inquiry design aimed at teaching advanced high-school to senior college students the basics of stellar populations. The inquiry is designed to have students come up with their own version of the Hertzsprung-Russell diagram as a tool to understand how stars evolve based on their color, mass, and luminosity. The inquiry makes use of pictures and spectra of stars, which the students analyze and interpret to answer the questions they come up with at the beginning...
Downloads: 1
[texts]Automated Morphological Classification of SDSS Red Sequence Galaxies - Judy Y. Cheng
(abridged) In the last decade, the advent of enormous galaxy surveys has motivated the development of automated morphological classification schemes to deal with large data volumes. Existing automated schemes can successfully distinguish between early and late type galaxies and identify merger candidates, but are inadequate for studying detailed morphologies of red sequence galaxies. To fill this need, we present a new automated classification scheme that focuses on making finer distinctions bet...
[texts]Excitonic switches at 100 K temperatures - G. Grosso
Photonic and optoelectronic devices may offer the opportunity to realize efficient signal processing at speeds higher than in conventional electronic devices. Switches form the building blocks for circuits and fast photonic switches have been realized [1,2,3,4,5,6]. Recently, proof of principle of exciton optoelectronic devices was demonstrated [7,8]. Potential advantages of excitonic devices include high operation and interconnection speed, small dimensions, and the opportunity to combine many ...
Downloads: 2
[texts]Star Clusters in M 31. IV. A Comparative Analysis of Absorption Line Indices in Old M 31 and Milky Way Clusters - Ricardo P. Schiavon
We present absorption line indices measured in the integrated spectra of globular clusters both from the Galaxy and from M 31. Our samples include 41 Galactic globular clusters, and more than 300 clusters in M 31. The conversion of instrumental equivalent widths into the Lick system is described, and zero-point uncertainties are provided. Comparison of line indices of old M 31 clusters and Galactic globular clusters suggests an absence of important differences in chemical composition between the...
Downloads: 1
[texts]The Effect of Major Mergers on Age and Metallicity Across the Fundamental Plane - L. A. Porter
Recent low-redshift observations have attempted to determine the star formation histories of elliptical galaxies by tracking correlations between the stellar population parameters (age and metallicity) and the structural parameters that enter the fundamental plane (size and velocity dispersion). These studies have found that velocity dispersion, rather than effective radius or dynamical mass, is the main predictor of a galaxy's stellar age and metallicity...
Downloads: 1
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